Grinding machine



Aug. 21, 1923.

1,465,762 R. D. GARDNER GRINDING MACHINE Filed Nov. 26, 1920 2 Sheets-Sheet 1 Aug. 21, 1923.

' R. D. GARDNER GRINDING MACHINE Filed Nov. 26

, 1920 2 Sheets-Sheet 2 7z @zzO fiwflv (x3. (-1, r

Patented Aug. 21 1923.

' ha rs-n srsrss RALPH D. GAR ER; or 'BELOIT, w soonsnvf;

GRINDING iu ionlnn.

Application filed November 26, 1920. Seria1'N0. :426,357.

To all whom may concern: v p

Be it known that I, RALPH D. GARDNER, a citizen oi the United States, residing at Beloit in the county of lock and State of Wisconsin, have invented certain new and useful improvements in Grinding hllaQllillGS,

of which the "following is a specification.

This invention relates in general to grinding machines, and more particularly to that type known as double spindle disc grinders,

which are particularly adapted to: simul taneensly linisiiing two opposite parallel faces of various articles or parts adapted to be operateduponby a niachineof this character. 1

In this general type of machine the grinding. wheels are mounted in opposed relation upon spindles, eacl journaledjin a carriage, the carriages being movable toward and from each other to move the grinding wheels towers or from the work which is positioned between them upon a suitable supporter work rest. i

, One of the'priinary' objects of invention is to provide novel and improved means for regulating the extent of approach of the grinding wheelsso that thework will be finished accurately, with the finished'faces se arated one from the other a uniform and prc aeterinined distance, andtoso construct; this mechanism that it is capable of a Very line regulation and adjustment, therebyiusuring accuracy in the finished product."

Another feature of the invention resides.

in the provision of novel means for limiting separating movement of the grinding wheels so as to insure againstexcessive separation" which might permit pieces of. work or other eb'cc'rs to dron between the wheels and the work rest with disastrous results tojthe i iachiue.

Another purpose of the invention is 10 provide a znzn'thine in whichone of thewheels maybe readily disconnected from the mechanism wluchniovcs them toward and 'ti'oin reach othei: therebyenabling the machine to he 'izscd with onewhcel only whendesired, the other wheel, which'has been disconnected from the operating mechanism being moved back into inoperative position.

of a double spindle grinder, butjalso is capable of use as asingle spindle'grinder whenever desirable.

A further feature of theinvention resides in the work rest upon which the work or ary The ina-i chine thus possesses not only the advantagesinventien being supported at both GliClSrllPOIli ad ustable supports so that the rest extends tioles to be finished are supported during the grinding operations, the work rest in mybeyond the perimeter ofthegrinding wheels at each side and affords a solid, substantial sn 3 )ort for the work whichis ca able of adjustinent to any desired position.

Other objects and advantag 'eons features of the invention will be readilyappneciated considered in connection with the accompanying drawings. 7 5' Referring. to the drawings:

as the same becomes better understood by reference to the following description when Fig. '1 is. a side elevation of a grinding niachine embodying my invention;

Fig. 2 is a planview thereof; and -e v Fig. 3 is a transverse'sectional view,';certain parts being shown in elevation, and

ot the frame is shaped to'providea pair of:

tables or guidewaysfi, upon cachet which certain parts-bein broken away-forclarity 7 By reference to the drawings it will be 'ohservedthat'the machine comprises essen-i tially, a frain e or base '5 on which the various workingparts are carried. The top is mounted a carriage 7. These carriages I are each provided withsuitable bearingsjin which the spindlesfi carryingthegrinding' whee'lsor discs 9 are journaled. The spin-v dles may be driven byfpower from any suitable source and may be equip'pcd with belt pulleys if desired, butinthe present instance, I have shown (/ZLClLSDlIUllQJ as directwhichthe grinding wheels are driven.

1y connnected with an electric motor ll'by Both the front andjback'oi the frame 5 are provided w th a face plate 1-2 in which is" formed an undercutslot 13- adapted to receivethe heads of bolts '14 by which a block 15 is adjustably secured tofthe face plateso as to be capable of iuljustnient horizontally when desired. Each block has vertically disposed undercut guide iTbS 16, between which; disposed a-;ve,rtically extending standard '17 which is vertically adjustable ii -the guideway and is locked in adjusted: position by set screws 18. Upon the upper ends 7 of the stanc'la-rd- 17; therelis fixedly" mounteda work rest' 15), wliicl1 extends transversely bc'tweenthe i'indin wheels 9' b w h and forins a rest or support forthe work or articles to be operated upon by the grinding wheels. It will befobvious thatthiswork y I rest is. rigidly but adjnstably supported at with an opening" 22,

' wheel. A suction pipe (not shown) may be nowbe described.

connected with the lower portion of the hood or casingto carry away the dust and part1- cles produced by the operation or the ma-' chine. V r

The car "ages so moved toward and from each other to bring the grinding whee s lnto operative relation. with the work on the worli rest, and to withdraw the same therefrom by means of suitable mechanism which will The tables 6 are provided with central slots or apertures and the left hand carriage 7, viewing Fig. 1, is equipped with a rack 24, whicl extends downwardly through this slot centrally oi the frame.

Upon a shaft extending transversely oi the frame there 15 fixed a 31111011 26 which constantly meshes with the rack 2%, the pinion being adapted to be rotated in a clockwise direction, viewing Flg. l, by means of a hand lever 27 fixed to the outer end of the shaft 7 26 or by a foot pedal 2-8 connected with the lever 2? by a link 29. it will be ob ions that when the'pinion is rotated in a clockwise direction, the left hand carriage will. be moved toward the work rest 19, and when pressure upon the hand lever or foot pedal is released, the carriage will be returned to normal position by av weight 31 suspended from a cable 32, which is connected at 33 with the carriage and is trained over a pulley at the end of the machine.

The other carriage lie also adaitcd to be connected to and ope 'ated' by the pinion 26, and with this end in view, I have provided a bar pivoted at 36 to the bottom of the right hand carriage the bar being extended lon 'i udinally o t the machine beneath the pinion 36 and provided on its upper surface near its free end with rack teeth 37. This end of the ba rests upon :1 -am or eccentric carried by a transversely eXtc-ndiup shaft 39 which is equipped at its outer end with a handle or lever ill. by which the cam may be actiuitcd. Thecanris so arranged that it atl'ords a support "for the rack directly beneath the center line of the gear 26. .Vhen the lever 41 is positioned as shown in Fig. 1, the? cam 38 will elevate the rack 37 into mesh with the pinion 26 so that upon movement of this pinion, the right hand carriage will be moved equally witlnbut in an opposite directo theleft'hand carriage. Actuation of the racy/o2 pinion 26 serves therefore, to move the carriag toward e ch other so as to bring the grinding wheels into operative relation with opposite sides of the work carried upon the work rest 19.

Should it be desira'ble to use the machine as a single spindle, instead of a double spindle inachine, theha-ndle s1 is swung in a countercloclnvise position tolower the cam.

38 and thereby-permit disengagement of the rack tronrthe pinion 26. grinding wheel may then be used as a single spindle machine, while: the right hand wheel and carriage i'eimiiiriclle.

In order to'limit the approach of grinding wheel so as'to ensure accuracy of The left hand the the finished product, I haveprovided means independent of the mechanism for moving" the carriages, whereby the extent of 'approach of the wheels may be limited and regulated with a line degree of accuracy. 1. s mechanism comprises two opposed members, one secured to each] carriage, whici, as the grinding wheels approach each other, are brought into .abbutting' relation, thereb limiting-this approaching movement. ne of these members con: sists of 'a stop bar 42 which extends through a guide 4L3 attached to the 'r'ight hand carriage, and a'similar guide ist attached to the left hand carriaq'e. The right i and end of connected to a block '40 adjustably secured hy a clampingbolt l6, which oper- :'-"s in an uncercut lot lat-armed in the o'er face oi tliecarrrge' T, to clamp the hlocl: ll) in adjusted position and thereby hold the stop 'bar -42 against movement 'to the ri 'l'il riage. when the carriage'is moved toward the left upon approaching movement of the grind ing wheels, the stop bar 42 will be come spoudingly moved tothe left. 7

Upon the left hand carriage in a suitable support I l have mounted an abutinent member which is disposed in align inent with the sto) bar i2 so that upon up preaching movement of the. left hand end oi? the stop bar and the right hand undo? the abutment element 4-8 we brought into abutting relation, which procludes turllcr approzu-hing niovei :nt of the carriages. rm the purpose oi, insuring a fine degree of ar-rairacv in adjustment, the

abutment element 71:8 is equipped with a micrometer zuljii lament elk and utter the position otgt-he stop bar-42 has been roughly fixed by setting the block '40. the approach of the grinding wheels maybe finely regulated by manipulation of this -microineter adjustment, which projects 'or retracts the abutment element 48 Lllltll llllQ exact adjust-1 ment'is secured.

' It is also desirable- "that the separating the stonbar abuts ae'ainstor.

rt-ilativelv tothis ri ht hand car- 1 h v it will be obvious theretore, that i. l '1 caiimner-i. toe

kind of work.

grinding wheels during thepositioning or \x 'ithdrmvel of tne Work from the li ith' this end ii its left ured ti view, the stop her 42 is provided 1 hand end with a; collar .vithdrev.-'n through the guide usteble collar 521s also serured guide and hysetting this collar in any desired position, the extent of sopthe grinding Wheels may be lini VJhen movement of the carriages rice, the collarfil, after e'limited amount of fiement, will he brought into cngiigemcn ler 52 being similarly engaged with the in a reasonable degre guide 43,-further separating*moveinent the carriages is precluded.

It will be apparent, therefore; thathave provided a machine in which the sop; eruting movements of the grinding: Wheels is liniited and capable of adjustmentor regulation, and that the zippreaching movement is also iimitechend may be regulated to a fine degree of accuracy by the micron;

eter adjustment provided. 7 lhe' regu mtm' mechanisms are simple, sulfiantieh zinc. durable, the Work support m rest sf} fords'e support for the Work which extends entirely across" the faces of the grinding wheels, and the support is capable of justnient bol h horizontdlly and vertically 0 meet the requirements of any particular The grinding: Wheels are moved toward and "from each other by Incoh- :inisni which is'simple in construction and easy to manipulate, and simple menns'is provided for disconnecting'one oi" the cur-j ridges from the operating mechanism so 1 hit the machine may be used a single sp nd e machine Wheneverdesired.

is believed that my invention, its construction, iodc of operation and many or its inherent advantages will he under-similfrom the rreg'oing Without, further descrip lion. and.

'd iothe iollmviiig claims.

claim: 1" r in a grinding machine, the cornbinm tion of 9; pair of opposedvrindiny' wheels, :1

0 movablecarriage for each Wheel means tor moving SEIICl Wheels toward and from each other, and means including a pair or ele-' ments, movable with their respective Wheels toward and from the other and adapted to 'froin'eech other, and a pair of men ibers 'eech' mounted to. movo ivith its' 51 fixedly ereto and of such size that it'- the slop bar the right hood end,

n the guide 4%, and the col-- v and sfinicrometeradjustmentfor said it should be mriniiiest 'thzrt the;

HPPIOdCll of said Wheels. i

2. In -a grinding machiile, the tion of '21 pair oil opposed grind means for moving said wheels A i ,r-mentzibut one zrgainst the other foriimi-ting the r respective Wheen-said members beingi; adept ed to limit the approach-or said wheels when j disposed in abutting relation, and one o said niembersheing adjustable to if the extent of approach of said Wheels. 7 1

In a grinding machine, the combinm tion or" pair of grinding'wheels. moving" saidkvheel's toward other, end means including a micro jiustment and 21' pair of 'nremb upon approaching movement the Wheels into abuttingenongement forylimiting the spproiichofssid heels.

In grinding ma'ch'ine, the combine-V tion or a, pair of grindingivheelgjmeans for v moving said wheels toward;anddroin each other, it stop her conneotedfivith 011601 saidwheels to more thereivitlnanden adjustable abutment member connected-with the other'vvheel 'to move therewith said her and member being movable into"i buttingfen j igageruentiupon epproachinp; movement of 7 said Wheels to thereby limit such'epproach. 15.111 a grinding mechinehthe' combine tion of pair of slidebly mounted carriages} ii grindingtool'cerried by each cerria ze, a stop bar movable with one or said carriages, en abutment member movable with the other carriage in alignmen with -.1 size h and means for adjusting thopos (ion 0 aTbul'mentinemb-er 'Xvhereby to verv' the. tent ol epfnoe'ch of said hiding tools;

6. In 21, grindingmachine, the (:oiiihiiin tion of a pairotcarriages a grinding tool mounted upon each carriage;meensfor IllOV- ino' said Cari-iegesflto wzii'd 'en l.;lirom each othe zgs slop bin mountedupon one or o, c: rrieg'e's, an" abutn'ient member mounted on theother carriage, said ebiitmentjnicinher and stop hair being adspt'cdlo bebrought into abutting" relation Withehc other upon approaching; movement of s'iid' cnrringegQ abut went in'i'ember whereby the eritenlf oi np- I preach of sziid carriages maybe regulated.

7. III- a grinding machine, the combing ingtoolmounted uponeiich carriage. means {or movingsaid czir'rriees toward and from each other, and'n'iezins'mounteduponand no'vahle Wlllll the respective cerr z -vcg'es into abutting engzigeme t with each other for linntmgthe approach of said tools; Y i 8. In grinding machine, the combinesaid carriages and projecting in proximity to the other carriage, and adjustable means mounted upon said other carriageinposition to engage with the end of said stop bar upon approaching movement of the carriages whereby to limit the extent of said approach; 1 d 9. In a grinding machine, the" combination ofa pair of movable carriages,a grind ing tool mounted upon each carriage, means for moving said carriages toward and fromeach other, a stop bar guide mounted on each carriage, a stop bar projecting through said guides, means for ad ustablv locking said 7 stop bar against movement relativeiy to one in position to engage the end of said bar upon approaching movement of of said carriages, and an abutment m iher adjustably mounted upon tlie other carr stop said carriages to thereby limit the extent of. such approach.

10. In a grinding machine, the combination of. a pair of movable carriages, agrinding tool mounted on each carriage, means for movingsaid carriarres toward and "from each other, a stop bar guide mounted on each carriage, a stop bar extending thro i said guides, and means on said stop bar prevent ing withdrawal of said bar through either extent .with said guides for limiting separating movements of said carriages, means for lockingsaid stop bar to one of said earl-urges, and means mounted on the other GZLZTIHQBJIP cludin g a micrometer adjustment, adapted to cooperate with said stop bar to limit the approach of said carriages.

12. In a grinding machine, the combination of a frame, a palr of opposed grinding wheels mounted thereon, pair of blocks adnrstably mounted on said frame, a standard carried by each block, and a worlr rest ed at its ends by said respective standards.

13. In a grinding machine, the combinaiiOIl of a frame, a pair of carriages slid-ably riounted thereon, a rack mounted upon one oiisaid carriages, bar .counectedwith the other carriage and provided withrack teeth opposed to the aforesaid rack, a gear wheel. disposed between said bar andrack and meshing with said rack, andmeans t'or mov ing said bar into or out of engagement with said gear to connect or disconnect one of said carriages, a gear mounted on said frame and meshing with said rack, a bar pivoted to the other carriage and provided with racl;

teeth adapted to mesh with said gear, and means tor achustably' supporting: the free end of said bar to dispose the, rack teeththereof into or out of engagement with. said gear. i

v 15. In a grinding machine. the combi'na tion of a frame, a pair of carriages slidably mountedthereon, means for moving said-. carriages toward and from each other, com: prising a gear rotatably mounted on said frame and a rack connected with cachet said carriages, and means for moving one of said racks into or out ot'engagement with said gear to thereby connect one of said carriages with or disconnect the same from said at will.

16. In a grinding machine, the combination of a frame, a pair of carriages slidably 35 mounted thereon, a gear rotatably mounted on said frame, rack mounted on one ot. said: carriages and meshing with said gear, barpivoted to the other'carriage and provided with rack teeth, and a movable support tor'therack tooth end of said bar for moving the'same into or out of operative relation with said 'ear.

17. In a grinding machine, ,he combina tion of a pair of movable carriages, means for moving the same toward and fi'OHl each other, comprisinga rotatable gear, a rack meshing"therewith and connected to one of i the carriages, a bar pivotally connected to the other carriage and provided with rack 1 teeth at its free end, and means including an adjustable connection for moving said bar into operative relation with said gear at will. I r 7 f 18. In a grinding machine, the combination of aframe, a pair of carriages slidahly' mounted thereon, a gear rotatably mounted on said frame. a pair of racks connected respectively with said carriages and adapted to mesh with said gear whereby movement 119 of one of said carriages is imparted to the other in an opposite direction and 'ineans whereby one of said. racks may be discon nected from said gear.

RALPH D. oannnunj 

